This game still captures my imagination and holds attention, even two years on.
The GOTY edition on PS3 was buggy and I had a lot of freezing problems with it, I eventually sold it and bought the non-GOTY edition, never looked back. It does freeze very occasionally, but it is far less often than GOTY.
Fallout 3 is small by comparison, and doesn't look as pretty in my opinion. The number of different ways there are to play the game is the key to it's longevity, as although the missions are the same the different character classes each play differently, so the missions still can feel fresh and exciting.
Just playing through this now as a High Elf, heavily dependant on magic but can still fight with sword and arrow.
Few games have such a lasting appeal for me; GTA 3 kept me coming back, Mercenaries 2 and a handful of others too.
I have just got Fallout 3 GOTY for the extra content so, touch wood, hopefully the reported bugs won't interfere with my game too much.